What IOS image are you using? I found a related bug:
CSCdr12571 Bug Details
Headline BGP: network backdoor functionality is broken
Product all Model
Component bgp Duplicate of
Severity 3 Status Resolved
First Found-in Version 12.2 12.0ST 12.1(0.9)
First Fixed-in Version 12.2(0.10) 12.0(14.6)ST 12.2(0.10)PI01
12.1(7.1) 12.0(14.6)ST01 12.2(0.18)S 12.1(7.5)E 12.1(08a)E 12.1(7.5)EC
12.2(3.4)PB 12.2(2)B
Release Notes
''network backdoor'' functionality is broken - when BGP receives
update
for backdoor network it installs it into routing table. Removing ''net
back'' command and putting it back into configuration solves the
problem (until BGP receives external update for the network).
There is no known workaround.
I don't see any reason for the behavior you're experiencing. Do you
think this might be the answer? Let us know if it turns out to be a
configuration issue.
John
>>> "Wilson, Christian" 1/28/02
7:49:08 AM >>>
I am struggling with BGP backdoor. I seem to get the more complicated
aspects of BGP, but this backdoor command is really getting me down. I
test
on Friday and would appreciate any help. In the configs below, BILBO
and
GLORI have EBGP connections to ELROND. BILBO and GLORI have a ISIS
connection between each other. ISIS is actually running on all the
routers
as an IGP. All the routers know about the network 3.0.0.0 from ISIS.
GLORI
injects 3.0.0.0 into BGP using the network command and the update is
sent
across the EBGP connection to ELROND, who in turn passes the update
across
his EBGP connection to BILBO. BILBO has the "network 3.0.0.0
backdoor"
added to his configuration, but the BGP route still appears in the
routing
table instead of the ISIS route. I have omitted a lot of the config
files
because they are huge and harsh to read through, but I tried to include
all
relevant text. I have tried this so many ways and times that I am
beginning
to have doubts about myself since such a seemingly simple task is
stumping
me. Please help!!
hostname Bilbo
interface Serial0/0
no ip address
encapsulation frame-relay
!
interface Serial0/0.1 multipoint
ip address 150.150.10.1 255.255.255.0
ip router isis
ip ospf network point-to-multipoint
!
interface Serial0/0.2 point-to-point
ip address 150.150.20.1 255.255.255.0
ip router isis
ipx network 200
ipx nlsp a1 enable
frame-relay interface-dlci 940
!
router bgp 100
network 3.0.0.0 backdoor
neighbor 150.150.20.2 remote-as 200
Bilbo#b
BGP table version is 2, local router ID is 200.200.9.1
Status codes: s suppressed, d damped, h history, * valid, > best, i -
internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 3.0.0.0 150.150.20.2 0 200 300 i
Bilbo#i
i L2 1.0.0.0/8 [115/20] via 150.150.20.2, Serial0/0.2
C 2.0.0.0/8 is directly connected, Virtual-TokenRing2
B 3.0.0.0/8 [20/0] via 150.150.20.2, 00:26:45
i L2 4.0.0.0/8 [115/20] via 150.150.10.2, Serial0/0.1
O E1 5.0.0.0/8 [110/128] via 150.150.10.3, 00:29:29, Serial0/0.1
O E1 200.200.220.0/24 [110/128] via 150.150.10.3, 00:29:29,
Serial0/0.1
hostname Elrond
interface Serial0/0.1 point-to-point
ip address 150.150.20.2 255.255.255.0
no ip directed-broadcast
ip router isis
ipx network 200
interface Serial0/0.3 point-to-point
ip address 150.150.21.1 255.255.255.0
no ip directed-broadcast
ip router isis
ipx network 21
router bgp 200
network 3.0.0.0 backdoor
neighbor 150.150.20.1 remote-as 100
neighbor 150.150.21.2 remote-as 300
Elrond#b
BGP table version is 2, local router ID is 200.200.240.1
Status codes: s suppressed, d damped, h history, * valid, > best, i -
internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 3.0.0.0 150.150.21.2 0 0 300 i
hostname GLORI
interface Serial0/0
ip address 150.150.10.2 255.255.255.0
no ip directed-broadcast
ip router isis
encapsulation frame-relay
interface Serial0/0.2 point-to-point
ip address 150.150.21.2 255.255.255.0
no ip directed-broadcast
ip router isis
ipx network 21
router bgp 300
network 3.0.0.0
neighbor 150.150.21.1 remote-as 200
GLORI#b
BGP table version is 2, local router ID is 200.200.230.1
Status codes: s suppressed, d damped, h history, * valid, > best, i -
internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 3.0.0.0 0.0.0.0 0 32768 i
GLORI#i
i L2 1.0.0.0/8 [115/30] via 150.150.10.1, Serial0/0
C 3.0.0.0/8 is directly connected, Virtual-TokenRing3
C 4.0.0.0/8 is directly connected, Virtual-TokenRing4
i L2 5.0.0.0/8 [115/84] via 150.150.10.1, Serial0/0
i L2 200.200.220.0/24 [115/84] via 150.150.10.1, Serial0/0
i L2 6.0.0.0/8 [115/84] via 150.150.10.1, Serial0/0
i L2 200.200.241.0/24 [115/84] via 150.150.10.1, Serial0/0
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